Fix error when unwrapConstraint receives an empty deviceId when creating local tracks

[mpnri]

Hi.
When createLocalTracks is called with an empty string deviceId ({deviceId: ""}), the unwrapConstraint function throws an error because it incorrectly evaluates empty strings as falsy values. This causes the function to throw "could not unwrap constraint" error when creating local tracks (audio or video)

and also it prevents the code properly clean up and stop created media tracks, resulting in browsers continuing to show camera/microphone in-use indicators even after the meet ends or fails.

create.ts

const newDeviceId = mediaStreamTrack.getSettings().deviceId;
if (
  trackConstraints?.deviceId &&
  //* this line throws when deviceId is an empty string in constraints
  //* like `{ ideal: "" }` or `{ exact: "" }`
  unwrapConstraint(trackConstraints.deviceId) !== newDeviceId
) {
  trackConstraints.deviceId = newDeviceId;
} else if (!trackConstraints) {
  trackConstraints = { deviceId: newDeviceId };
}

[changeset-bot]

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